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package com.sun.appserv.web.cache.filter;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.Locale;
/** HttpCacheEntry
* Each entry holds cached (HTTP) response:
* a) response bytes b) response headers c) expiryTime
* d) parameterEncoding used e) entryKey this entry represents,
* to match the entry within the hash bucket.
*
* XXX: should implement methods to enable serialization of cached response?
*/
public class HttpCacheEntry {
public static final int VALUE_NOT_SET = -1;
int statusCode;
String statusMessage;
HashMap responseHeaders;
HashMap dateHeaders;
ArrayList cookies;
String contentType;
Locale locale;
int contentLength;
// XXX: other cacheable response info
byte[] bytes;
int timeout;
volatile long expireTime = 0;
/**
* set the real expire time
* @param expireTime in milli seconds
*/
public void setExpireTime(long expireTime) {
this.expireTime = expireTime;
}
/**
* compute when this entry to be expired based on timeout relative to
* current time.
* @param timeout in seconds
*/
public void computeExpireTime(int timeout) {
this.timeout = timeout;
// timeout is relative to current time
this.expireTime = (timeout == -1) ? timeout :
System.currentTimeMillis() + (timeout * 1000);
}
/**
* is this response still valid?
*/
public boolean isValid() {
return (expireTime > System.currentTimeMillis() || expireTime == -1);
}
/**
* clear the contents
*/
public void clear() {
bytes = null;
responseHeaders = null;
cookies = null;
}
/**
* get the size
* @return size of this entry in bytes
* Note: this is only approximate
*/
public int getSize() {
int size = 0;
if (bytes != null) {
size = bytes.length;
}
// size of response bytes plus headers (each approx 20 chars or 40 bytes)
return (size + (40 * responseHeaders.size()) );
}
}
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